Predict exactly how many tricks you will take — not one more or less.
Plump is a tactical game where you predict exactly how many tricks you will take. Predict right and you score; predict wrong and you take a blot on the scoresheet.
A standard 52-card deck, no jokers. Aces are high and twos are low. Draw a scoresheet with the players' names across the top and one row per round.
The number of cards in hand changes every round. Start with the highest number that goes round evenly, then deal one card fewer each round, down to one card each. At one card it is common to play as many rounds as there are players. Then turn around and add a card per round until you are back at the starting number.
Once the cards are dealt, everyone in turn predicts how many tricks they will take, and it is written down. The last player to bid may not bid a number that makes the bids add up to the number of cards dealt. If five cards were dealt and the others have bid four between them, the last player may not bid one. That guarantees at least one player misses their bid every round.
The player to the dealer's left leads. You must follow suit: if you hold the suit led, you have to play it. If you do not, you may discard any card. The trick is won by the highest card of the suit led, and its winner leads the next one. There is no trump suit.
Make your bid exactly and you score ten points plus one per trick. Bid two and take two and that is twelve. A bid of zero that holds scores ten. Miss your bid and you score nothing for the round and take a blot. Most points when the last round is played wins.